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#
# This file is part of Checkbox.
#
# Copyright 2008 Canonical Ltd.
#
# Checkbox is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# Checkbox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
from struct import calcsize
def get_bitmask(key):
bitmask = []
for value in reversed(key.split()):
value = int(value, 16)
bitmask.append(value)
return bitmask
def get_bitcount(bitmask):
bitcount = 0
for value in bitmask:
while value:
bitcount += 1
value &= (value - 1)
return bitcount
def test_bit(bit, bitmask, bits=None):
if bits is None:
bits = calcsize("l") * 8
offset = bit % bits
long = int(bit / bits)
if long >= len(bitmask):
return 0
return (bitmask[long] >> offset) & 1
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